The Balloon Brothers

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Across
  1. 5. easily able to catch fire and burn quickly
  2. 6. Early ____ sometimes reported having produced an unknown flammable gas during their experiments.
  3. 8. the smallest part of a substance that can exist by themselves, made of one or more atoms
  4. 9. In his early forties, Joseph became ____ with the possibility of flight.
  5. 10. I performed an ____, a test or trial to prove my hypothesis.
Down
  1. 1. a scientist who studies the nature and properties of energy and matter
  2. 2. a high level of standing or respect
  3. 3. dipped or placed into a fluid or some other substance that surrounds completely
  4. 4. the outer covering or bag of an airship that holds gas or heated air
  5. 6. easily catching fire or burning up
  6. 7. the ability or tendency to float